Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Sydney Marie Thayer, MD

Individual provider Maternal & Fetal Medicine Physician · NPI 1427581768

Dr. Sydney Marie Thayer, MD is an Obstetrics/Gynecology in Saint Louis, Missouri. Graduated from University of California, San Diego School of Medicine in 2017, 9 years ago. Practices with Washington University Physicians in Illinois Inc, a 167-clinician group and accepts Medicare assignment. Licensed in Missouri.

Years since qualifying
9
Trained at
University of California, San Diego School of Medicine
Licensed in
MO
In the registry since
2017
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

4901 Forest Park Ave Div OBGYN Mfm And US Ste 710
Saint Louis, MO 63108-1495
Phone: (314) 454-8181
Fax: (314) 747-1429
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Obstetrics & Gynecology Physician (primary) Taxonomy 207V00000X · Licence 2021016990 (MO)
Maternal & Fetal Medicine Physician Taxonomy 207VM0101X · Licence 2021016990 (MO)

Record details

NPI number1427581768
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 4, 2017
Last updated in NPPESApril 17, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyOBSTETRICS/GYNECOLOGY
Medical schoolUNIVERSITY OF CALIFORNIA, SAN DIEGO SCHOOL OF MEDICINE
Graduated 2017 (9 years in practice)
Group practice Washington University Physicians In Illinois Inc — 167 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations10 on file with Medicare

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